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Mozilla releases Firefox 53 introduces Quantum Compositor and patches security vulnerabilities

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Mozilla released its Firefox 53 update with a new browser engine and also patches 39 vulnerabilities in the browser. The new browser engine technology named Quantum Compositor in Firefox 53 is an effort to accelerate and improve the browsing experience to help reduce the number of browser crashes due to graphics issues.

With the Quantum Compositor, the graphics are rendered separately from the Firefox process. " The compositor determines what you see on your screen by flattening into one image all the layers of graphics that the browser computes, kind of like how Photoshop combines layers," Nick Nguyen, vice president for Firefox at Mozilla.

The Firefox 53 also introduces the two new interface themes. One is compact user interface with the default Firefox color scheme and other darker color scheme for night browsing.

In addition to browser improvements, a total of 39 security vulnerabilities were patched. Of these 39, seven was rated to be critical by Mozilla. One of the critical bugs deals with the memory safety, two dealt with out-of-bounds memory errors and a critical buffer overflow issues has been patched.

Other than these critical issues, it also patched three sandbox escape issues which were rated to be high impact. The Firefox sandbox is intended to restrict the ability of a process to access areas of system outside the sandbox.

A long awaited update was released by Mozilla and hope this update will reduce the browser crashes the Firefox was facing.

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Frequently asked questions ( 5 )

Q

What is a legacy extension?

A

Extensions built using frameworks that are not compatible with Firefox 57 and beyond (such as SDK or XUL) are considered “legacy” extensions.

Q

Can you recommend replacements for my legacy extensions?

A

Yes! Go to the Add-ons Manager (Tools menu > Add-ons, or type about:addons into a new tab) and select Legacy Extensions. Click on “Find a Replacement” next to each legacy extension for a recommended alternative. You can read more about this feature in our blog.

Q

When will Firefox ESR stop supporting legacy extensions?

A

Firefox Extended Support Release (ESR) version 52 is the last version that will support legacy extensions. ESR 52 will no longer be supported on September 5, 2018.

In October 2018, all legacy add-ons will be disabled on addons.mozilla.org (AMO). Once this happens, users will no longer be able to find legacy add-ons on AMO.

Q

What happened to my Flash-related add-on?

A

Starting with the Firefox 55 release, Adobe Flash does not run by default as Click-to-run Flash is built into the browser. You can chose how you want Flash to behave on certain sites or all sites.

Some of the most popular Flash extensions were providing this capability before it became part of the browser. Since these extensions are now obsolete, they will likely no longer be supported by developers and will no longer work.

Q

What happened to my complete theme?

A

Complete themes do not work with Firefox 57+ and are disabled. If you use a dark complete theme, the Dark Theme option in the Add-on Manager might be a good option for you. Go to the Themes tab in about:addons and give it a try. We are making improvements to themes in the coming months, so look for themes with additional functionality beyond an image overlay in future releases.

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